To be fair everything being complained about in this thread is pretty clearly broken stuff.
And for design, I'm actually harsh over stuff like the new "top comment" box that, when clicked on, /completely removes the normal comment interface/, shrinks the video, and moves the comments to a new and otherwise-completely-unseen comment interface to the right side of the video. Which is bizarre, inexplicable user experience and a fair amount worse than simply being a weird color.
But yeah the new design is pretty awful. No idea what they were thinking.